1. Satellite internet connects remote areas lacking terrestrial infrastructure. 2. Satellite internet uses ground stations to link to terrestrial networks. 3. Inter-satellite links can remove ground infrastructure for user connectivity. Which are correct?

1. LEO constellations use many satellites for near-continuous coverage. 2. LEO ground user terminals do not track moving satellites across the sky. 3. Satellite internet needs smaller user antennas than satellite TV. Which are correct?

4G Networks: Packet vs Circuit Switching - Which is/are correct? 1. Packet switching sends data in packets; circuit switching uses a dedicated path. 2. 4G uses packet-switched architecture for both data and voice. Select the correct answer:

Regarding LTE (Long-Term Evolution), what is/are correct? 1. LTE uses Orthogonal Frequency Division Multiplexing (OFDM) for data transmission. 2. LTE networks always require fallback to 3G networks for voice communication. Select the correct answer:

With reference to spectrum usage in 4G networks, what is/are correct? 1. Lower frequency bands provide wider coverage compared to higher frequency bands. 2. Higher frequency bands provide greater data capacity but generally lower coverage.

1. Optical fibres transmit information by converting electrical signals into light pulses. 2. Total internal reflection enables light to propagate through fibre core. 3. Optical fibres are unaffected by physical bending of the cable. Which are correct?

1. Optical fibres are immune to electromagnetic interference. 2. Optical fibres always provide lower latency than wireless communication systems. 3. Optical fibres support high-bandwidth data transmission. Which statements are correct?

1. Optical amplifiers can boost signals without converting them into electrical signals. 2. Dispersion in optical fibres can lead to signal distortion over long distances. 3. Optical fibre communication requires a direct line-of-sight. Which are correct?

1. Micro-OLEDs are typically built on silicon wafers rather than glass substrates. 2. Micro-OLED display emits its own light without requiring a backlight. 3. Micro-OLED displays rely on liquid crystal modulation to produce images. Which are correct?

1. Micro-OLEDs achieve much higher pixel density than conventional OLEDs. 2. Micro-OLEDs are commonly used in compact devices such as AR/VR headsets. 3. Micro-OLEDs use less power than all other display technologies in every scenario. Which are correct?

1. Micro-OLEDs require external illumination to function effectively in low-light conditions. 2. They offer high contrast by turning off individual pixels. 3. They can be integrated with semiconductor circuits on a single chip. Which are correct?

Which are correct for experiments by missions like Axiom-4 on ISS: 1. Microgravity enables experiments hard to replicate on Earth. 2. All experiments focus on space technologies. 3. Studies human physiology for long-duration spaceflight effects.